Poss. Lady Diana's 15-Great Aunt. HM Juan Carlos' 14-Great Grandmother. Philippe of Belgium's 14-Great Grandmother. Grand Duke Henri's 14-Great Grandmother. HM Margrethe II's 14-Great Grandmother. HM Beatrix's 14-Great Grandmother. HM Carl XVI Gustaf's 14-Great Grandmother. HM Harald V's 13-Great Grandmother. Wm. von Bismarck's 10-Great Aunt. `Red Baron' Richthofen's 12-Great Aunt.